netdev - Re: [PATCH net-next] ipv4: tcp: fix TOS value in ACK messages sent from TIME

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Message-Id: <20111024.030632.1448353383063978213.davem@davemloft.net>
Date:	Mon, 24 Oct 2011 03:06:32 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, muralira@...gle.com, ak@...ux.intel.com,
	hidden@...abit.hu
Subject: Re: [PATCH net-next] ipv4: tcp: fix TOS value in ACK messages sent
 from TIME_WAIT

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 21 Oct 2011 12:29:25 +0200

> There is a long standing bug in linux tcp stack, about ACK messages sent
> on behalf of TIME_WAIT sockets.
> 
> In the IP header of the ACK message, we choose to reflect TOS field of
> incoming message, and this might break some setups.
> 
> Example of things that were broken :
>   - Routing using TOS as a selector
>   - Firewalls
>   - Trafic classification / shaping
> 
> We now remember in timewait structure the inet tos field and use it in
> ACK generation, and route lookup.
> 
> Notes :
>  - We still reflect incoming TOS in RST messages.
>  - We could extend MuraliRaja Muniraju patch to report TOS value in
> netlink messages for TIME_WAIT sockets.
>  - A patch is needed for IPv6
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks a lot Eric.
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